Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a18582fbda02a3…

MALICIOUS

PDF

72.2 KB Created: 2021-09-30 22:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e705b4bbbe00daea37cf4d11fa839877 SHA-1: 00efb24ffc10a0d4b02ed0d6a08e1559b206657c SHA-256: e3a18582fbda02a38f338f8dfd127097477a2abc2c700557e55addd93bc0ca64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coebmsf.com/userfiles/file/90048128210.pdf In PDF document text
    • https://ww150003.linebot.net/upfile/files/20210929184507.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/17380136859.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/86475289584.pdfIn PDF document text
    • http://freeorden.com/media/file/menaruxiperovig.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134234bd0711---98557459841.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/45383702080.pdfIn PDF document text
    • https://bfull.ru/uploads/files/molaneb.pdfIn PDF document text
    • http://haphadoor.com/upload/files/kajufawugufamo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/jukumutulab.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/15616457467.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/91038626483.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/xufefimatonudaxudofam.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/tasemimij.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/doluxuleleronowulik.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144230742b86---65287032796.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/renitumapi.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/53864704310.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/jepulupanatekotifekawa.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/xatovuxenowidijamorop.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lfk0ivu89rrq94iduk8nekpd8r/75750550579.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xerifenafalidufo.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/87138260751.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/70200654181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=descargar+whatsapp+plus+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 17676 bytes
SHA-256: 9bfc738264704a923945883a43843e68a18f0d9ca42fe1136346816f2b413b97
font_01_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 10980 bytes
SHA-256: 379cfa05960fa219a6b50640f17afb9e9fd6f597b28971130efce5c8d0c9f215
font_02_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1